Look at it another way, legally...

Suppose Hoppdoc's scenario except the No.2 man misses and the critter takes off for parts unknown. In many places #1 pays for the animal collected or not.

It's #1's lion.

After such an adventure #1 might just want to make good to #2 in some major way.

I had a very bad situation with a bear {recounted elsewhere} in which my then-13-year-old son fired the last shot with the muzzle of his rifle shoved into the chest of the bear. The bear was at my feet and my revolver was empty. Granted, he's my son but whenever the tale is told I try my level best to describe the bear as "ours"!

Like Ripp says, for myriad reasons there are people you do not want as hunting partners. I'll take my son anywhere anytime and frankly, he can have the trophies.